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  2. Hyperthymesia - Wikipedia

    en.wikipedia.org/wiki/Hyperthymesia

    People with hyperthymesia also have difficulties letting go of difficult events or traumatic memories, which can stay with them for life. Joey DeGrandis, who was featured in the magazine Time said, "I do tend to dwell on things longer than the average person, and when something painful does happen, like a break-up or the loss of a family member ...

  3. Eye color - Wikipedia

    en.wikipedia.org/wiki/Eye_color

    Eye color is an inherited trait determined by multiple genes. [14] [15] These genes are sought by studying small changes in the genes themselves and in neighboring genes, called single-nucleotide polymorphisms or SNPs. The total number of genes that contribute to eye color is unknown, but there are a few likely candidates.

  4. Tetrachromacy - Wikipedia

    en.wikipedia.org/wiki/Tetrachromacy

    The four pigments in a bird's cone cells (in this example, estrildid finches) extend the range of color vision into the ultraviolet. [1]Tetrachromacy (from Greek tetra, meaning "four" and chroma, meaning "color") is the condition of possessing four independent channels for conveying color information, or possessing four types of cone cell in the eye.

  5. Baby with extremely rare defect born with one eye in middle ...

    www.aol.com/news/2015-10-06-baby-with-extremely...

    A tragic photo of a baby born with only one eye and no nose has been circulating the Internet. The baby is being referred to as "baby cyclops" due to the comparisons drawn with the mythical cyclops.

  6. Evolution of color vision - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_color_vision

    Today, most mammals possess dichromatic vision, corresponding to protanopia red–green color blindness. They can thus see violet, blue, green and yellow light, but cannot see ultraviolet or deep red light. [5] [6] This was probably a feature of the first mammalian ancestors, which were likely small, nocturnal, and burrowing.

  7. Synesthesia - Wikipedia

    en.wikipedia.org/wiki/Synesthesia

    Grapheme–color synesthetes, as a group, share significant preferences for the color of each letter (e.g., A tends to be red; O tends to be white or black; S tends to be yellow, etc.) [20] Nonetheless, there is a great variety in types of synesthesia, and within each type, individuals report differing triggers for their sensations and ...

  8. Achromatopsia - Wikipedia

    en.wikipedia.org/wiki/Achromatopsia

    Some colors can be estimated through the use of colored filters. By comparing the luminosity of a color with and without a filter (or between two different filters), the color can be estimated. This is the premise of monocular lenses and the SeeKey. In some US states, achromats can use a red filter while driving to determine the color of a ...

  9. Congenital blindness - Wikipedia

    en.wikipedia.org/wiki/Congenital_blindness

    People that are pregnant from families with a history of congenital blindness will be closely monitored and need to carry out genetic testing in order to identify whether there is a mutation or not. Red reflex testing is done in neonates, infants, and children to assess eye and vision function. [ 26 ]